<template>
  <section class="todoapp">
    <!-- 除了驼峰, 还可以使用-转换链接 -->
    <TodoHeader :arr="list" @create="createFn"></TodoHeader>
    <TodoMain :arr="showArr" @del="deleteFn"></TodoMain>
    <TodoFooter :farr="showArr" @changeType="typeFn" @clear="clearFun"></TodoFooter>
  </section>
</template>

<script>
// 1.0 样式引入
import "./styles/base.css"
import "./styles/index.css"
    
import TodoHeader from "./components/TodoHeader";
import TodoMain from "./components/TodoMain";
import TodoFooter from "./components/TodoFooter";


export default {
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter,
  },
  data() {
    return {
      list: [
        { id: 100, name: "吃饭", isDone: true },
        { id: 101, name: "睡觉", isDone: false },
        { id: 102, name: "打豆豆", isDone: true },
      ],
      getSel:"all"
    };
  },
  methods: {
    createFn(taskName) {
      let id = this.list.length == 0 ?
      100 : this.list[this.list.length-1].id + 1
      this.list.push({
        id:id,
        name:taskName,
        isDone:false
      })
    },
    deleteFn(theId) {
      let index = this.list.findIndex(obj =>
      obj.id === theId)
      this.list.splice(index,1)
    },
    typeFn(str){
      this.getSel = str
    },
    clearFun(){
     this.list = this.list.filter(obj => obj.isDone == false)
    }
  },
  computed: {
    showArr() {
      if (this.getSel === 'yes') {
        return this.list.filter(obj =>obj.isDone === true)
      } else if(this.getSel === 'no') {
        return this.list.filter(obj =>obj.isDone === false)
      } else {
        return this.list
      }
    }
  }
};
</script>